linux-kernel - [PATCH 08/11] mv64x60_wdt: Add a module parameter to change nowayout setting

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Date:	Tue, 24 Jul 2007 11:17:23 -0700
From:	"Dale Farnsworth" <dale@...nsworth.org>
To:	Wim Van Sebroeck <wim@...ana.be>, linux-kernel@...r.kernel.org
Subject: [PATCH 08/11] mv64x60_wdt: Add a module parameter to change nowayout setting

Also, use the WATCHDOG_NOWAYOUT macro, rather than #ifdefs,
and use __module_get to prevent module unloading if WATCHDOG_NOWAYOUT
is set.

Signed-off-by: Dale Farnsworth <dale@...nsworth.org>
---
 drivers/char/watchdog/mv64x60_wdt.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

Index: linux-2.6-powerpc-wdt/drivers/char/watchdog/mv64x60_wdt.c
===================================================================
--- linux-2.6-powerpc-wdt.orig/drivers/char/watchdog/mv64x60_wdt.c	2007-07-19 22:11:42.000000000 +0000
+++ linux-2.6-powerpc-wdt/drivers/char/watchdog/mv64x60_wdt.c	2007-07-19 22:34:01.000000000 +0000
@@ -45,6 +45,10 @@ static void __iomem *mv64x60_wdt_regs;
 static int mv64x60_wdt_timeout;
 static unsigned int bus_clk;
 
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
 static void mv64x60_wdt_reg_write(u32 val)
 {
 	/* Allow write only to CTL1 / CTL2 fields, retaining values in
@@ -99,6 +103,9 @@ static int mv64x60_wdt_open(struct inode
 	if (test_and_set_bit(MV64x60_WDOG_FLAG_OPENED, &wdt_flags))
 		return -EBUSY;
 
+	if (nowayout)
+		__module_get(THIS_MODULE);
+
 	mv64x60_wdt_service();
 	mv64x60_wdt_handler_enable();
 
@@ -109,9 +116,8 @@ static int mv64x60_wdt_release(struct in
 {
 	mv64x60_wdt_service();
 
-#if !defined(CONFIG_WATCHDOG_NOWAYOUT)
-	mv64x60_wdt_handler_disable();
-#endif
+	if (!nowayout)
+		mv64x60_wdt_handler_disable();
 
 	clear_bit(MV64x60_WDOG_FLAG_OPENED, &wdt_flags);
 

-
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